Combination gas and coal stove



H. G; MERSFELDER.

COMBINATION GAS AND COAL STOVE. APPLICATION FILED OCT. 26, 1917.

1,355,991, Patented Oct. 19,1920.

Mm 0 p PATENT OFFICE.

HARRY G. MERSFELDER, 0F CINCINNATI, OHIO. i

COMBINATION GAS AND GOAL STOVE.

I Application filed October 26, 1917. Serial No.

To all whom it may concern:

Be it known that I, HARRY G. Mans- FELDER, a citizen of the United States, and a resident ofCincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Combination Gas and Coal Stoves, of which the following is a full, clear, and exact de scription, reference being had to the ac companying drawing, forming part of this specification.

My invention relates f to combination stoves in which either gaseous or solid fuel may be used, and more particularly relates to the oven portion of such stoves. I

There are many devices of the above type in the art in some of which the gas burners are removed entirely from the ovens when not in use, in some of which the burn ers are secured to a movable part, as the oven door so as to swing out of the way therewith, and in some of which the burn ers are always in the way, or else are exposed to the smoke and dust from the coal fire when not in use. In my device the burners remain permanently. in place, are

set out of the way, and, to avoid the sooting and clogging of them when coal or wood isused as fuel, I provide a novel device whereby the burners may be entirely cut off from the oven and the hot airjacket around it. y

The devices for inclosing the burners and for opening communication between them and the oven are coupled with. a damper for permitting the products of combustion from the gasto escape from the oven into the hot air jacket. I

. The above features and other advantages I provide by means of that certain structure and relation of parts to behereinafter mpr e specifically pointed out and claimed.

In the drawing,

Figure 1 is a frontelevation of a stove, partly broken away to show the interior of the oven and the gas burner chamber.

Fig. 2 is a side elevation of the stove, with the gas burner box omitted. I

The stove hasthe supporting legs 1 and main casing 2. In the casing are the grate bars'3 for solid fuel, to which grateaccess is given by the fire door 4, and beneath which is the ash door'5. The oven 6 .1s mounted in'the-casing alongside of the fire box, and if desired, over the one end of the oven gas burner box 7 maybe mounted.

Specification of Letters Patent.

Patented Oct. 19, 1920.

The oven is separated from the main cas- I ing of the stove so as to leave a hot air space or jacket 8. The oven has the usual door 9 and to enforce travel of the products of combustion from the fire box throughout the hot air space around the oven there is a damper such as at 10.

The structure of the stove as so far explained in brief is no more or less than any usual type of stove construction and is in tended to be merely illustrative of the usual coal stove, except, of course, for the gas burner box referred to. The device which will now be described and which constitutes my invention may be applied to this stove, and with a few. slight and obvious changes in the oven and main stove casings could be applied to any stove now in use so far as I am aware.

Formed in the outside wall of the stove casing adjacent the outside bottom edge of the oven is aburncr chamber or pocket formed of a top plate, '11 extending clear across the side of the stove casing, a bottom plate 12 alsoextending across, and a sliding damper 13 of any usual type to form the outside wall.- The damper should have a sufiicient number of openings to supply.

proper air to the burner. The gas burner comprises a straight pipe 14 with its outlets directed inwardly toward the oven, and it is supplied with gaswfrom a suitable valve 15.; A rock shaft 16 is mounted acrossthe inside of the oven just below the burner chamber andhas on it a shutterl? that when closed by rocking the shaft over will lie across the space between the bottom edge of the oven and the outside casing of the stove and shut off this space all along the side of the oven. This shuts off the hot air jacket from the burner chamber from below.

Located across the stove somewhat above the bottom edge of the oven is another rock shaft 18 which has on it a like vents. along the sides of thejfalse bottom if desired. At the edge of the oven nearest the burner, the oven wall is cut away at 22 and on the rock shaft 18, which is located against the oven wall just above this out, is secured a second shutter plate 23. The parts are set so that when the shutter 19 on the said shaft 18 is closed, then the plate 28 will be open.

A common operator for the two rock shafts, and hence the three shutters, would thus either connect the burner to the oven or cut it off entirely from the stove. Thus when the shutters 17, 19 and 23 are all swung as shown in Fig. 1, the burner chamher is cut off from the air space around the oven by the shutters 17 and 19, and has a free communication with the oven because the shutter 23 is raised. This communication with the oven, it should be noted, is with the space beneath the false bottom.

When the shutters are swung the opposite way from that shown in Fig. 1, the shutter 17 closes off the burner chamber from the stove by swinging up against the outside stove wall. The shutter 19 swingsup out of the space between the oven and the stove wall so as to permit the free passage of hot air around the oven, and the shutter 23 closes down against the base of the oven and cuts it ofi from the hot air space.

One other feature necessary where the products of combustion of the gas burner are introduced into the oven, is a damper to permit the said products to escape from the oven into the back flue. This damper is provided at 2a, with a slide plate on the outside of the oven havinga rod 25 extending along the oven, for operating it. This rod 25 is also connected up with the common operator so that when the burner is opened into the oven the damper is opened, and when the burner is shut off from the stove the damper is closed.

The common operation for the above parts is provided as follows. A crank 25 is secured to the rock shaft 16 for manually rocking it. At the far end of the shaft 16 there is formed on it or secured to it, a crank 26. The crank 26 is pivoted to a bar 28 that extends up along the rear of the oven and at its upper end is pivoted to the bell crank 25 that is itself pivoted to the rod 25 of the oven damper. The bar 28 moves up as the shutter 17 on the shaft 16 moves up, and the moving up of the bar rocks the bell crank and pushes over the damper, to shut it.

The rock shaft 18 has on its end farthest within the oven a link or arm 30 which is pivoted to the bar 28, so that the moving up of the shutter 17 will be accom panied by a moving up of the shutter 19 and a moving down of the shutter 23.

The air to the burner when same is connected with the oven comes through the damper 13, passes around the burner and thence is forced together with products of combustion along the space between the false bottom and the regular oven bottom. This gives the best results from the point of view of heating the oven, that is possible in a device of this nature, particularly as the products of combustion must pass around in the oven after they come up past the false bottom, before they can escape through the damper 24. i

The details of'construction in the device illustrated for the purposes of explaining the invention herein are not insisted upon as essential, as the stove above describedis merely a preferred form in which I have developed my said invention.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination with a range for burning solid fuel, having an oven with a hot air flue surrounding same for solid fuel heating, of a gas burner mounted within the range outside ofthe hot air flue, with a passage from the gas burner into theoven, said passage and burner being arranged "to direct the flames directlyacross thebase of the oven, shiftable'mean-s forsimultaneously closing the solid fuel flue so as to con-fine'the gases to the baseof-the oven only and for opening-the passage from the burner'to the oven and an airinletforthe burner located behind the burner in line with the passa e.

2. The combination with a range or burning solid fuel, having an-oven with a hot airflue surrounding same forsolid fuel heating, of a gas burner mounted within the range outside of the hot air flue, with a passage from the gas burner into the oven, said passage and burner being arranged to direct the flames directly across the base of the oven, a damper for closing saidflue so as to confine the gases to the baseof'the oven, and opening said passageway as desiredand an air inlet for the burner locatedbehind the burner in line with the passage.

3. The combination with a range for burning solid fuel, havingan oven with a hot air flue surrounding same for solid fuel heating, of a gas burner mounted within the range outside of the hot air'flue, with a passage from the gas burner into the oven, said passageway crossing the hot air flue, with a pair of dampers to complete the transverse passage from the burner to oven when shifted in one direction, .and to close said passageway and open the solid fuel flue when shifted in the other direction, said passage and burner being arranged to direct the flames directly across the base of the oven, and an air inletfor the burner located behind the burner in line with the passage. 7

4. The combination with a range for burning solid fuel, having an oven with a hot air flue surrounding same for solid fuel heating, of a gas burner mounted within the range outside of the hot air flue, with a passage from the gas burner into the oven, said passageway crossing the hot air flue, with a pair of dampers, and means for oper ating them simultaneously, to complete the transverse passage from burner to oven when shifted in one direction, and to close said passageway and open the solid fuel flue when shifted in the other direction, said passage and burner being arranged to direct the flames directly across the base of the oven, and an air inlet for the burner located behind the burner in line with the passage.

5. The combination with a range for burning solid fuel, having an oven with a hot air flue surrounding same for solid fuel heating, of a gas burner mounted within the range outside of the hot air flue, with a passage from the gas burner into the oven, said passage and burner being arranged to direct the flames across the base of the oven; openings from the oven to the hot air flue, and dampers for controlling the opening and closing of said flue and passageway, means for coupling said dampers together for simultaneous operation whereby the stove may be utilized for the burning of solid or gaseous fuel as desired and an air inlet for the burner locatedbehind the burner in line with the passage, said damper for the flue being adapted to confine the gases to the base of the oven only.

HARRY G. MERSFELDER. 

